1. 1.4 Stem-and-Leaf Plots, Histograms, and Circle Graphs Objectives: Make and interpret a stem-and-leaf plot, a histogram Standards: 2.6.5A Organize and display data using pictures, tallies, tables, charts, bar and circle graphs. 2.6.8E Analyze and display data in a stem-and-leaf plot. and circle graphs. 2.6.8E Analyze and display data in a stem-and-leaf plot.

2. Do Now Order the data from least to greatest. 78, 95, 92, 84, 86, 82, 74, 73, 70, 86, 90, 91,81, 85, 89

3. Definition: A stem-and-leaf plot is a graph that splits data into 2 parts: a stem and leaf. StemLeaf

4. The numbers of defective widgets in batches of 1000 are given below. Use the data to make a stem-and- leaf plot. 14, 12, 8, 9, 13, 20, 15, 9, 21, 8, 13, 19 Number of Defective Widgets per Batch Stem Leaves 0 8 8 9 9 1 2 3 3 4 5 9 2 0 1 The tens digits are the stems. The ones digits are the leaves. List the leaves from least to greatest within each row. Title the graph and add a key. Key: 1|9 means 19

5. Example 1 Organize data from the Do Now using a stem-and-leaf plot. Include a key

7. Ex2. A bakery collected the following data about the # of loaves of bread sold each of the 24 business days: 53, 49, 27, 48, 60, 52, 44, 38, 47, 52, 82,46, 55, 31, 39, 54, 51, 47, 50, 45, 50, 61, 43, and 64. Make a stem-and-leaf plot of the data. Find the median and mode(s) of the data. How can the owner use the stem-and-leaf plot to make plans for baking bread?

8. II.Histogram – a bar graph that shows the frequency of each value. See Textbook Pg. 59

11. *Ex 2. The given data shows the # of people in 24 vehicles hat passed a designated checkpoint. 1, 4, 1, 2, 2, 1, 3, 1, 3, 2, 2, 6, 4, 2, 1, 1, 2, 4, 3, 1, 2, 4, 2, 3. Make a frequency table for these data. Make a histogram from the frequency table. #Frequency 1 2 3 4 5 6

13. Practice Textbook: p.62/1,3,5 P.65/10

14. Exit Question A. When would you use a stem and leaf plot to display data? B. When would you use a histogram to display data?

16. Review of Stem-and-Leaf Plots, Histograms, and Circle Graphs